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Related Experiment Videos

Two independent spiral structures control cell shape in Caulobacter.

Natalie A Dye1, Zachary Pincus, Julie A Theriot

  • 1Department of Biochemistry, Stanford University, Stanford, CA 94305, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 14, 2005
PubMed
Summary

Bacterial cell shape maintenance involves MreB and MreC proteins forming distinct spirals. These proteins regulate peptidoglycan transpeptidase Pbp2 localization, ensuring proper cell morphology in Caulobacter.

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Area of Science:

  • Bacteriology
  • Cell Biology
  • Microbial Morphology

Background:

  • Bacterial actin homolog MreB is crucial for cell shape.
  • The role of coexpressed MreC protein in bacterial morphology remains less understood.

Purpose of the Study:

  • To investigate the function of MreC in Caulobacter.
  • To elucidate the relationship between MreB, MreC, and peptidoglycan transpeptidase Pbp2 in cell shape determination.

Main Methods:

  • Depletion studies of MreB and MreC proteins.
  • Localization studies using fluorescent protein fusions (GFP-Pbp2).
  • Inhibition of MreB with A22.
  • Development of a computational method for shape variance analysis.

Main Results:

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  • MreC forms a periplasmic spiral out of phase with the cytoplasmic MreB spiral.
  • Both MreB and MreC are essential for cell shape; their depletion causes similar defects.
  • MreB and MreC can form spirals independently.
  • Pbp2 localizes helically, partially colocalizing with MreC.
  • MreB and MreC are necessary for helical Pbp2 localization, but not sufficient.
  • FtsZ depletion rescues Pbp2 helical localization in the presence of MreB inhibitor A22.
  • FtsZ depletion partially rescues A22-induced cell shape deformation.

Conclusions:

  • MreB and MreC form distinct, independently localized spirals.
  • MreB and MreC differentially regulate Pbp2 localization to ensure helical patterns.
  • These mechanisms are vital for maintaining proper Caulobacter cell morphology.